Distinguish between:
(a) a common acid-base indicator and a universal indicator,
(b) the acidity of bases and basicity of acids,
(c) acid and alkali (other than indicators).
Distinguish between:
(a) a common acid-base indicator and a universal indicator,
(b) the acidity of bases and basicity of acids,
(c) acid and alkali (other than indicators).
(a)A chemical indicator is a substance that can show a change of a measurable parameter in response to a change in the solution. The change should be observable such as a colour change, temperature change, precipitate formation, etc. The substances that cause a colour change in response to the pH of the medium are called acid-base indicators because these substances are used to identify the termination of an acid-base reaction. Indicators show different colours at different pH values. The term universal indicator is used to name a chemical compound that can act as an indicator for a wide range of pH values. The main difference between the acid-base indicator and universal indicator is that acid-base indicators show colour changes at a certain pH range whereas universal indicators show colour changes at a wide variety of pH values ranging from 0 to 14.
(b) Acidity is the number of H+ ions required by a base and Basicity is the number of OH- ions required by an acid to form a salt.
(c)Acids and alkaline are two terms often found in aquatic chemistry. Acids are chemical species that show acidic characteristics. Alkaline is a type of base. Therefore, alkaline solutions show basic properties. The main difference between Acid and Alkaline is that the pH of acids lies below pH 7 whereas the pH of alkaline is above pH 7.
(a)A chemical indicator is a substance that can show a change of a measurable parameter in response to a change in the solution. The change should be observable such as a colour change, temperature change, precipitate formation, etc. The substances that cause a colour change in response to the pH of the medium are called acid-base indicators because these substances are used to identify the termination of an acid-base reaction. Indicators show different colours at different pH values. The term universal indicator is used to name a chemical compound that can act as an indicator for a wide range of pH values. The main difference between the acid-base indicator and universal indicator is that acid-base indicators show colour changes at a certain pH range whereas universal indicators show colour changes at a wide variety of pH values ranging from 0 to 14.
(b) Acidity is the number of H+ ions required by a base and Basicity is the number of OH- ions required by an acid to form a salt.
(c)Acids and alkaline are two terms often found in aquatic chemistry. Acids are chemical species that show acidic characteristics. Alkaline is a type of base. Therefore, alkaline solutions show basic properties. The main difference between Acid and Alkaline is that the pH of acids lies below pH 7 whereas the pH of alkaline is above pH 7.
